<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>index</title>
    <style>
        #pageHeight{
          height:1300px
        }
         #file {
            height:150px;
            width:300px;
            position:absolute;
            top:34%;
            left:30%;
            z-index:99999
         }
    </style>
</head>
<body>
<input  type="file" value="file" id="file"/>
</body>
<script>

</script>
</html>